234 CATALOGUE OF THE FOSSILS OF THE PERMIAN SYSTEM 
their transverse articulations are rather distant, the joints are 
longer than wide. The rays of the inferior lobe of the tail are 
larger than those of the superior, and more bifurcated to- 
wards their extremity. The scales are of a middling size ; 
their surface is marked with irregular strie, and punctures which 
are most numerous on the anterior scales.”—Ag. 
This species, with the preceding, must be considered as com- 
paratively rare. 
5 P. MacRopTuHALmts, Ag. 
Paleoniscus macropthalmus, Ag., Poiss. Foss. ii., p. 99, pl. 
Over has: 
In the Marl-slate; rather rare. Cullercoats Bay. 
“The head of this fish is larger in proportion to the rest of 
the body than in the other species. It is rather more than one- 
fourth of the length of the body. The fins are very small, and 
their rays are very thin, and bifurcated nearly to their ex- 
tremity. The transverse articulations are very distant. The 
scales are very small, and of nearly the same size on all parts of 
the body. The surface of the scales is furrowed with many ir- 
regular striz. The posterior side of the scale is not serrated." —Ag. 
2, PLATYSOMUS, Ag. 
1. P. macrurvs, Ag. 
Platysomus macrurus, Ag., Poiss. Foss. ii, p. 170, pl. 18, 
f. 1, 2.—Sedgw., Geol. Tr. 2nd ser., iii., pl. 12, f. 1, 2. 
In Marl-slate ; rather rare. Hast Thickley, Thrislington Gap. 
This is by much the largest species of Platysomus found in 
the Marl-slate. It may be easily distinguished from the other 
species by its large tail, and the great width of the anterior part 
of the body. A specimen in the Newcastle Museum has the 
teeth finely preserved. They are of a tubercular form, and very 
much polished. 
2. P. striatus, Ag. 
Platysomus striatus, Ag., Poiss. Foss. ii., p. 168, pl. 17, £ 1— 
4,—Sedew., Geol. Tr., 2nd. ser. iii., pl. 12, f. 3, 4. 
In the Marl-slate ; rather rare. Whitley, Thrislington Gap. 
The body of this fish is rounder than in the other species. Its 
